Interdict makes it trivial to take out any mob - mobs can't outdo players in subsystem damage and eventually succumb to subsystem crash, it takes a lot of time but is basically 100% safe as long as the nanoseer interdicting isn't attacked. This was used to take out cosmpiercer guards back when cosmpiercers still had them. Now it's being used to take out faction guards.
I don't think that's the intended use, especially since the raiding party can bring along an unenemied nanoseer who will just interdict - and will never be targeted as a result. This means a single player can make all the faction guards pointless and very easy to kill, and the only real counter to that is to make sure player defenders are always available. Outburst was changed to prevent a situation where one player can easily mess with a faction's guards with no risk, but Interdict still allows it - and if anything is even worse, because outburst only moves them, but interdict allows any raiding force to easily and safely kill them.
I don't know how to change the ability to fix this problem, but it can't stay the way it is now. Right now, faction guards are pointless and require babysitting and protection rather than protecting anything themselves.